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Restructuring Activities (Tables)
 3 Months Ended
Mar. 31, 2014
Restructuring and Related Activities [Abstract]  
Changes in restructuring liabilities
Changes in the restructuring liabilities, substantially all of which are employee-related, during the periods ended March 31, 2014 and December 31, 2013 are summarized as follows ($ in millions):
 
Three Months Ended
 
Year Ended
 
March 31,
2014
 
December 31,
2013
Balance at beginning of year
$
4.7

 
$
3.4

Accruals for announced programs
0.1

 
3.9

Cash payments
(1.2
)
 
(2.7
)
Exchange rate impacts
—

 
0.1

Balance at end of period
$
3.6

 
$
4.7